Indycar suspension ?

Watching todays race and the pit stops it appeared there was no front suspension. No movement at all when jacked up.

Sort of like a go kart.

They typically run about an inch of travel, total.

Also ground effect aero doesn't work terribly well when the car moves up and down.

"Any suspension can be made to work if you dont allow it to work." Or something like that

Also, the reason they still run the taller sidewalls is because a good bit of the suspension is actually handled by the tires.

All of the above is correct.

Just like a kart except for the aero.

Take a look at this article: http://www.motoiq.com/MagazineArticles/ID/3485/PageID/7721/Nerds-Eye-View-Dale-Coyne-Racing-IndyCar.aspx

On a big, flat track like that, all you are concerned with is the camber curve. Higher level stock cars, like from super late model up, will generally run a bumpstop and a front shock with massive rebound damping. Hit the braking zone for the first corner, it hits the stops, and the shocks hold it down til the end of the race. I've seen cars that can take up to five minutes to unbind themselves.

I'd bet that if the rules didn't state that the cars need upper and lower control arms, somebody would run a solid front axle or a kart (none) suspension.

Anyway, what you don't see is that the spring and shock are all inboard and are located under a cover in the nose.

Yes, the video show that.

The springs and shocks just don't allow much ,if any, wheel travel.

Have a look at modern F1 suspension. They don't even use suspension pivots (rod ends et al) anymore for the control arms. It's all tuned flexure through fragile looking little blades of metal bolted to the chassis.